SOAPHelper for amazon-ec2 gem

soap_helper_for_amazon-ec2.rb

class SOAPHelper
	class << self
		def data_from(data, wrapper)
			data[wrapper] || data
		end

		def items_from(set)
			unless set && set.item
				nil
			else
				items = set.item
				items = [items] unless Array === items
				items
			end
		end
	end
end

data = SOAPHelper.data_from(
	@ec2.describe_instances,
	'DescribeInstancesResponse'
)
reservations = SOAPHelper.items_from(data.reservationSet) || []
...